Furnace-roof.



E. E. SLICK.

FURNACE ROOF.

APPLICATION FILED APR. 18, 1912. 1,088,634, Patented Feb. 24, 1914,

2 SHEETS-SHEET l.

wn'msszs mvmo E. E. SLICK.

FURNACE ROOF.

APPLIOATION FILED APR.18, 1912.

Patented Feb. 241, 1914.

2 SHEETS-SHEET 2.

EDWIN E. SLICK, OF PITTSBURGH, PENNSYLVANIA.

FURNACE-ROOF.

Specification of Letters Patent.

Patented Feb. 24, 1914.

Application filed April 18, 1912. Serial No. 691,613.

To all whom it may concern:

Be it known that I, EDWIN E. suck, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Furnace-Roof, of which the following is a specificatioii.

My invention relates to the construction and arrangement of the roofs of metallurgical and heating furnaces, and while not restricted to such use, more particularly relates to the construction of regenerative open hearth furnace roofs.

One object of my invention is to provide a furnace roof constructionhaving novel means whereby the refractory roof is Water cooled, overheating thereof is avoided and overcome, and the life of the roof is greatly prolonged.

Another object of the invention is to provide a furnace roof construction having novel means whereby the refractory roof is supported and maintained in place.

A further object of my invention is to provide a furnace roof of improved construction having novel means whereby the refractory roof is equably cooled.

A still further object of this invention is to provide a furnace roof construction which is flat, a roof construction having improved means whereby the roof is supported on the framework surrounding the furnace walls and a constructionin which the use of the usual arched roof is avoided and rendered unnecessary.

Further objects of my invention will appear hereinafter as the invention is more fully described and claimed.

Referring to the accompanying drawings forming part of this specification, Figure 1 is a side elevation showing one-half of a furnace constructed and arranged in accordance with my invention, the furnace being symmetrical about the line X-X of Fig. 1. Fig. 2 is a sectional end elevation of the same, thesection being taken on the line II-H of Fig. 1. Fig. 3 is a sectional detail, on a larger scale, showing the construction of the refractory bricks and of the water cooled boxes forming the supports or girders by which the refractory bricks or blocks are suspended in position and are maintained in place to form the roof structure. Fig. 4 is a similar enlarged sectional detail showing a modification in the construction of the means employed in suspending the refractory bricks from the water cooled roof supports or girders. t

In the drawings 2 designates an open hearth furnace having side walls 3 constructed in the usual manner. The refractory side and end walls of the furnace are stayed in accordance with the usual practice by means of the buckstaves 4. The construction of the buckstaves and the manner in which they are tied together, not forming part of this invention, will not be further described.

Supported from the inside face of the buckstaves 4 is a series of hollow water cooled boxes forming supports or girders 5, these supports extending lengthwise across the width of the furnace with the adjacent side surfaces of the hollow supports substantially in contact.

In the construction shown in Figs. 1, 2 and 3, the lower or bottom face of the hollow Water cooled boxes forming the supports 5 has an under-cut recess 6 forming a dove-tail groove extending from end to end of the support, and one edge of the rcfrac tory blocks or bricks 7 has a dovetailed projection 8 which is arranged to enter the undercut recess 6 in the lower face of the supports 5, the series of bricks in each of the rows of bricks being placed in position singly so that each brick is supported from the supports 5, by its dovetail portion 8, independently of the other bricks on the support. The recesses in the supports and dovetails 8 on the bricks 7 -are made of such relative size as will permit a brick or block being removed and replaced at any point in the length of the supports, and the space 9 in the dovetailed recesses is filled with small pieces of brick or mortar or both so as to secure the bricks 7 with their upper faces 10 in close contact With the lower faces 11 of the supports. Thin mortar or grout is also employed to obtain the desired close contact between the adjacent faces of the bricks and the support, and the bricks are laid with their faces in close contact, mortar or grout also being used between the side and end faces of the bricks to secure the desired tight joint.

The supports5 are positioned to bring the ends 12 of the rows of bricks in adjacent rows into engagement and when desired, the bricks may be made so as to be unsymmetrical in' length about a center line through the dovetailed portion thereof, so that the joints between theends of the bricks in adjacent rowsof bricks will be broken. In such construction the ends of the bricks in one support will overlap those in the adjoining supports so as to break the joints.

At the junction of the lengthwise inclined end portions with the horizontally extending intermediate portion of the roof, the ends 12 of the bricks are beveled to the desired angle as applied in place, as will be clearly seen in the broken or sectional part of Fig. 1.

In the modified construction shown in Fig. 4 the bricks or blocks 7 are suspended by their ends, recesses 13 in the ends of the bricks being engaged by washers 14 on the lower ends of the bolts 15, which in turn are suspended between the adjacent sides of the hollow water cooled supports 5*. In this modification the water cooled supports 5 do not have the undercut or dovetailed recess on their lower side, the bricks 7 have no dovetailed projections on their upper faces as in the construction of Figs. 1, 2 and 3, the construction otherwise being the same as in the preceding figures.

Suitable water inlet and outlet pipes are provided on each of the water cooled supports, preferably being arranged so as to maintain the water or other cooling fluid under a head or slight pressure.

The advantages of my invention will be apparent to those skilled in the art. By the use of the hollow Water cooled boxes to form supports for the refractory portions of the furnace roofs, the refractory portions of the roof are prevented from becoming overheated. By securing the bricks in close engagement with the contacting surfaces of the hollow supports, radiation of the cooling effect of the water in the cooling boxes is effectively transmitted to the refractory blocks or bricks. The novel manner in which the bricks or blocks are secured on the supports enables repairs and renewals of portions of the roofs to be readily made, and permits of patching of the roofs when desired. The fiat roof construction over comes concentration of the heat in the fur-- nace, caused by the use of the arched roof construction and avoids the side thrust put.

upon the sides of the furnace in the usual arched construction.

Modifications in the construction and arrangement of the parts may be made without departing from my invention. Open boxes may be used instead of the closed boxes shown, the refractory lining may be a monolith or each supportmay have, an integral refractory lining thereon. The supports may be arranged to extend lengthwise of the furnace instead of transversely as shown, and other changes may be made within the scope of my invention as defined in the appended claims.

I claim 2- 1. In a furnace a fiat roof comprising a series of rows of hollow water-cooled lining supports and a refractory lining suspended from said supports, with the-contacting flat faces of the lining and supports in close engagement, said supports and lining having c -act-ing dovetailed recesses and projections whereby the lining is fastened in place on the supports. f

2. Ina furnace a fiat roof comprising a series of rows of water-cooled lining supports and a sectional refractory lining suspended from said supports, with the contacting faces of the lining and supports in close engagement, said supports and lining having co-acting dovetailed recesses and projections whereby the lining is maintained in place on the supports.

3. In a furnace a flat roof comprising a series of rows of Water-cooled supports and a refractory lining suspended from said supports, the contacting surfaces of the supports and refractory lining being in close engagement, dovetailed recesses in the under faces of the supports and dovetailed projections on the refractory lining engaging with said recesses in securing the lining in place on the supports.

4. In a furnace a fiat roof comprising a series of rows of water-cooled supports eX- tending lengthwise across the width of the furnace and having flat lining engaging faces and a sectional refractory lining suspended from said supports, the contacting fiat surfaces of the supports and lining being in close engagement, dovetailed recesses in the under face of the supports and dovetailed projections on the refractory lining engaging with said recesses in securing the lining sections in position on the supports.

5. In a furnace a flat roof comprising in combination water-cooled supports and a flat roof lining formed of refractory material and suspended from said supports, said lining having interlocking engagement with the supports to prevent relative vertical displacement.

In testimony whereof, I have hereunto set I my hand.

' EDWIN E. SLICK.

Witnesses:

G. W. NEILL, EARLE R. WALKER. 

